window.onload = function () {
    var draw = document.getElementsByClassName("draw");
    var seals = document.getElementsByClassName("seals");
    // console.log(seals);
    for(var i= 0; i<draw.length;i++){
        draw[i].souYin = i;
        // seals[j].index = j;
        draw[i].onclick = function(){
           this.style.display = "none";
            seals[this.souYin].style.display = "block";
        }
    }
}